Explorative data analysis techniques and unsupervised clustering methods to support clinical assessment of Chronic Obstructive Pulmonary Disease (COPD) phenotypes. - Matteo Paoletti; Gianna Camiciottoli; Eleonora Meoni; Francesca Bigazzi; Lucia Cestelli; Massimo Pistolesi; Carlo Marchesi (J. Biomed. Informatics, 2009)